Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 152, Issue -, Pages 38-42Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2018.04.055
Keywords
Cascades; Coherent twin boundary; Defects; Migration
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Funding
- National Key R&D Program of China [2017YFB0702002]
- Scientific Challenge Project of China [TZ2018001]
- National Natural Science Foundation of China [11627901]
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With large-scale molecular dynamics simulations, we investigate systematically displacement cascades in nano-twinned Cu with different twin spacings. Coherent twin boundaries (CTBs) are proven to be effective defect sinks, and they exhibit preferential absorption of interstitials. The existence of twin boundary affected zone is confirmed, and its width depends on the energy of primary knock-on atom. When stacking fault tetrahedra nucleate near CTBs, their growth are suppressed, resulting in truncation. CTB migration is observed, which is induced by transient internal stress arising from collision cascades.
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